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Hybrid Vehicles Toyota Highlander Hybrid New Toyota Highlander Hybrid Owners - Give Us Your Report
143 messages, Last post on Nov 19, 2009 at 10:23 AM
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Replying to: nsxwes (Dec 29, 2006 6:48 pm) Sure hope we are not all misinformed. You asked a very good question. I did ask a local Toyota mechanic about this earlier this year (5000 mi service) when I first read about this "Idle Speed Control" issue on-line. He gave a fairly detailed explanation then and it made sense at the time. I will tell you only what I can remember. It has been 11 months now. There is an "Idle Air Control System" in the HH. This system controls several valves that regulate air intake which in turn influences idle speed. The car comes with preset data for controlling the valves but it is capable of learning and adapting to actual use. It then keeps the new information in memory somewhere for subsequent use. The computer will keep adjusting this information as the car is being used. This "learned" data is lost whenever the 12V is disconnected or when it dies. He said that there is really no switch that resets this system. Left alone, the engine computer will relearn all such information after sometime. During this relearning period, the car may get poorer gas mileage depending on engine conditions and driving habits. He told me that as a courtesy to loyal customers, he will run a Toyota (not just HH) through its paces at various RPM to do a diagnostic. Then he takes it for a test drive at various speed. This is equivalent to a "reset". Even then, it will take actual usage conditions for the engine computer to relearn everything. I do not know if this matches what other owners have been experiencing. Hopefully someone else can post what they have learnt. As our HH still has the original 12V, we have not had to do any "reset" of the ISC. |
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Replying to: cdptrap (Dec 30, 2006 2:40 pm) |
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Replying to: cdptrap (Dec 30, 2006 2:40 pm) |
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Replying to: katzjamr (Jan 01, 2007 8:48 pm) We too got a HH late '05 and have been suffering with a "dead battery" problem for the past couple months (not the traction battery, but the 12V battery that starts the car). We've had it in and out of the dealer throughout December and I just took it back. One "interesting" comment made to me by the dealer mechanic this morning is that it's a known issue that you cannot let the car sit for more than a day without starting it. For us, if we leave it off for more than a day or two the battery typical dies. The dealer is contacting Toyota and I'm hoping they replace the battery and/or upsize it. Good to hear others are not have the same issue...that they can leaves theirs off for days. The whole idea seemed silly to me. |
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Replying to: hh_newbie (Jan 02, 2007 9:41 am) |
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Replying to: hh_newbie (Jan 02, 2007 9:41 am) |
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Replying to: hh_newbie (Jan 02, 2007 9:41 am) Whoever said this is not an owner and have no clue what he or she is talking about. Ask him to prove it. Most of us owners will not tolerate such limitation and you can be sure the NHTSA would have received numerous complaints if this were true. Our HH sat for a week while we were gone on a trip last Winter. The car was out under a tree exposed to rain, some snow and freezing temperature. I forgot to hook up the little solar trickle charger to the 12V but when we got home, it started without a problem. Are we the only special case? I think not. As long as the 12V indicator shows blue, your 12V is fine. Like all cars, car batteries do die and when they do, we will get a new one and cruise on... |
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Replying to: nsxwes (Dec 23, 2006 2:09 pm) sam71 |
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Just a quick note that my gas mileage is back to normal now which is an average of 27 to 28 mpg. Right after the 12 volt battery was replaced it was close to 20/21, a day or two later it was up to 22/23 and now after a week is back to normal. It appears that the engine computer has relearned properly  Wes |
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Replying to: nsxwes (Jan 04, 2007 8:17 pm) Just to be sure, he ran the comment past his Toyota contact who confirmed I shouldn't be having these issues. I didn't realize that the traction batteries actually started the engine...in fact I'm still suspicious. To start the HH when it died, I just put a battery charger on the 12V battery. It takes a good 5 minutes of charging before it starts the engine and there is a load on the charger when I try to start it. Perhaps there is a solenoid it's trying to engage?? In any case, I did have a radar detector installed in the car. I can neither confirm or deny the charger was left on the last time the car died (wife's car) so I just took it out all together. Other than that and a DVD player installed at time of purchase...it is pretty much stock. If it continues to die after sitting for a couple days I'll have to escalate the matter w/ Toyota. For now I'm going to think happy thoughts and hope the problem was just with a radar detector being left on. (Ok, no one wreck my dream...I know a radar detector has minimal draw - but this will be my "happy place" until it dies again )
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